High temperature plastic deformation behavior of non-oriented electrical steel

Abstract

High temperature plastic deformation behavior of non-orientated electrical steel was investigated by Gleeble 1500 thermo-mechanical simulator at strain rate of 0.01−10 s −1 and high temperature of 500−1 200 ℃. The stress level factor (α), stress exponent (n), structural factor (A) and activation energy (Q) of high temperature plastic deformation process of non-orientated electrical steel in different temperature ranges were calculated by the Arrhenius model. The results show that, with dynamic elevation of deformation temperature, phase transformation from α-Fe to γ-Fe takes place simultaneously during plastic deformation, dynamic recovery and dynamic recrystallization process, leading to an irregular change of the steady flow stress. For high temperature plastic deformation between 500 and 800 ℃, the calculated values of α, n, A, and Q are 0.039 0 MPa −1 , 7.93, 1.9×10 18 s −1 , and 334.8 kJ/mol, respectively, and for high temperature plastic deformation between 1 050 and 1 200 ℃, the calculated values of α, n, A, and Q are 0.125 8 MPa −1 , 5.29, 1.0×10 28 s −1 , and 769.9 kJ/mol, respectively.

Effect of Phase Transformation and Latent Heat on Hot Rolling Deformation Behavior of Non-oriented Electrical Steel

“…The transverse difference of temperature and microstructure will together contribute to the uneven distribution of deformation resistance of material. Due to the high temperature deformation characteristics in dual-phase region is opposite to the austenite or ferrite single phase region, 6) and the latent heat is released simultaneously with the phase transformation, the accuracy of roll force prediction is decreased by using the traditional austenitic rolling model in which the influences of microstructure difference and latent heat are neglected, which will cause thickness oversize or abnormal wave and seriously affect the product quality and stability during hot rolling process of non-oriented electrical steel. 7) In order to make clear the influence of phase transformation on hot rolling deformation behavior, the researchers have studied from three aspects: deformation resistance model, effect of phase transformation on rolling deformation and effect of latent heat due to phase transformation.…”

Determination the causes of premature destruction of sheet electrical steel

“…This steel is an alloy of iron with silicon, the content of which in it is 0.8 -4.8 % and impurity elements. Silicon is introduced into iron in the form of ferrosilicon (an alloy of FeSi with iron) and is present in it in a dissolved state [1][2][3][4][5][6]. Silicon reacts with a more harmful (for the magnetic properties of iron) impurity -oxygen, reducing iron from its FeO oxides and forming silica SiO2, which partially passes into slag.…”

Online Roll Force Model for Non-Oriented Electrical Steel Considering Temperature-Transformation-Roll Force Coupling Effect

“…Wang et al 11) and Y.D. Xiao et al 12) adopted the traditional models to represent the deformation resistance of the austenite region, the ferrite region and the dual-phase region, which quantified the effects of deformation temperature, strain and strain rate on the deformation resistance in each phase region. However, such models are essentially statistical models, which adopt the functions of macro deformation factors and simply couple or equivalently deal with each effect, so that the effect of microstructure evolution on the macro mechanical deformation behavior cannot be reflected in the dual-phase region.…”